Conduit-fastener.



E VERETT M. COFFIN, OF-PIEDMVONT, CALIFORNIA.

CONQUIT-FASTENEE.

Sp'ecication of Letters Patnt. Patented Deazdn, 1918,

eppueation med December a?, 1916. serial No. 139,132.

To all whom t may concern.'

Be it known that I, Evnnn'rr M. CormN, a citizen of the United States,residing at n Piedmont in the county of Alameda and A tect a wire entering aswitch box, outlet box State of fastener in position adjacent to the hole in alifornia, have invented new and useful Improvements in Conduit-Fasteners, of which the following is a.- specification.

This invention relates to improvements in conduit fasteners, such aslare employed for. securing in position a conduit used to proor plate. p

Always heretofore, so far as my knowledge extends, in securing such a conduit to a switch box by a fastener, besides placing the the switch box, and with a part thereof exi tending through said hole, passing the con-v tivelyto another.

vsaid fastener; Figs. 4, 5 and 6 are' views,

duit through the fastener, and clamping the -fastener around the conduit, other operations have been necessary, such as additionally securing the fastener to the switch box, or changing the relative position of some part of the fastener, as by bending the same,

lutely necessary.

in the accompanying drawing, Figure 1.- is a perspective view, looking obliquely from the rear, of one form of my improved conduit fastener; Fig. 2 is a yfront perspective view, a wvall of av switch box being shown partly in section; Fig. 3 is a view similar to Fig. 2, showing also a conduit clamped in similar to Figs. l, 2 and 3, of another form `of the invention; Figs. 7, 8 and 9 are views,

similar to Figs. 1, 2 and 3, of a third form thereof; Figs. 10 and 11 are sectional views showing other modes of useof said third form; Fig. 12 is a perspective view of a fourth form of the invention.- 4

Referrin tothe drawing, 1 indicates my improved astener, formed of a singlepiece o f somewhat stiff non-resilient sheet metal, cut out from a blank to form aband, tube or ring 2. One end of this tube is square there- -said recess 5, forming to, but the other end has a longitudinal ex- -tension 3 formed by .widening a portion of'l the band, andthe band andextension are folded or doubled along a linetransverse to the general direction of the Aband to form a lateral outward extension 4 of said extension, the material on op-posite sides of the fold being -pressed firmly together to form a shoulder 4 extending outwardly from said band. A recess 5 is formed in the outer edge hole 7 in said wall 6, through Awhich hole 7 the conduit can enter the switch box, the 'parts of the shoulder 4 on opposite sides'of arranged to .abut against said Iwall 6.

rlhe terminal portions of the band extend outward, rst approximately parallel with each other, one, 10, of them being. longer than the other', 11, and beingbent over or around the end of the other, but spaced therefrom, so that the band is large enough to permit the conduit. to be passed thereof this )shoulder sufficiently wide to receive 4 the edge of wall 6 of a switch box around a two stops 8 and 9 opposite sides ofv through. l The stop 8 of the conduit fastener ispassed through the hole 7 in the wall of the switch box and said conduit fastener is.'

placed in position with the two stops 8 and 9 abutting against opposite. sides of the wall of the switch box. `When the conduit has been passed through the band, said-terminal portions are pressed tightly together by a suitable instrument, thereby contracting the band `around the conduit. The conduit is there rmly secured to the switch box. v in `the form of thel invention shown Figs. 4, 5 and 6, said other end ofthe band is extended, as shown at 13, by wldening its terminal portions 20, 21, and vsaid terminal portions extend in like manner as iu the form, but in this case a recess 15 suciently .wide to receive the edge of the wall of the switch box is made in said terminal portions,v

thus forming two stops l18 and 19, which are adapted to abut against opposite sides' of the wall of the switch box. When' the conduit has been passed through the band, both of-'said terminal portions 20, 21 are then `pressed tightly together, thereby contracting the band around the conduit and firmly clamping the conduit therein.

'in the form of he invention shown in Figs. 7, 8 and 9, the tube or band besides being extended longitudinally .on4 onel side,YV as shown at 27, is formed with an extension l prevent endwise motion,

lwall of a switch box.

-28 from the end ofthe extension 27, said ex-v tension 28 being in a plane transverse to the vaxis of said tube, instead of being parallel of the invention, the extension 28 on one side yof the wall, and the extension comprising the terminal portions 30, 31, on its other side, prevent the conduit from moving longitudinally in relation to the switch box. The extension28 is formed/with a small hole 34 suiiciently large to enable asmall nail or screw to be passed therethrough by which the'fastener can be secured at the outlet to as shown in Fig. 10, or can be secured to the back of a piece of wood to which `the outlet box is fastened, thereby preventingl endwise motion and securing `the conduit inthe outlet box. In Fig, 11 the extension is shown as secured between a wooden piece 86 and a metalplate 37 secured thereto.

sion 39, the remainder of the tube being apx proximately cylindrical. .Saidextension is recessed from its outer edge to form two ystops 40, L11, engaging .opposite sides of a When said extension 39 is completely collapsed, the,tube 38 is clamped around the conduit.

I do not show herein any small prongs pressed inwardly from the material forming vthe band, as these are common in the art and may or may not be used as desired.

It will be seen that the principle. embodied so that when said terminal portions the band is 4contracted around the conduit. In this form in the form of a tubeA the same, namely, that the ring or tube ,should have a part or extension 9 or 19 or30 4 and 31, o r 41, adapted to 'contact with one side of a wall hole therein and should also have a part 8,

of a switchlbox adjacent to a 18, 28 or 40 extending through said hole and adapted to engage the other side of said wall when the conduit is in the tube, and that said part 8, 18, 28 or 40 should be capable of passing through said hole, whenthe condult is out of the` tube, by rstmoving thegtube in a direction parallel with the wall, so that said extension is oppositeto said hole,and then transversely thereto, but is incapable of passing through said hole Whenthe conduit is in the tube, and that the fastener should also comprise means, as the terminal portions tube.

I claim 1. A fastener for securing an electric con.- duitentering a switch or outlet box compr1sing a ring, one end of which hasvatv'one slde onlyv a longitudinal extension length not less than the thickness of the box, sa'id extension having at its free end a lateral outward exol the tube,- for clamping the conduit in the.

tension, the opposite side of the same end of the ring being free from obstructions pre- Y venting movement of the ringvln the direction transverse thereto and opposlte to that of the last-namedextension.

2. A fastener for securing an electric coni duit entering va switch or outlet box comprising a one-piece ring, an end of which hasat one side only a longitudinal extension length not less than the thickness of the' box, said extension having at its free end a lateral outward extension, the opposite side of the same',

end of the ring being'free from obstructlons 8l rection transverse thereto and opposite to w preventing movement of the ring/inthe dithat of the last-named extension.

v E. M. COFFIN. 

